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14 CLINICAL STUDIES 14.8 Treatment of Venous Thromboembolism and Reduction in Risk of Recurrent Venous Thromboembolism in Pediatric Patients Rivaroxaban for oral suspension for the treatment of venous thromboembolism (VTE) and reduction in the risk of recurrent VTE was evaluated in the EINSTEIN Junior Phase 3 study [NCT02234843], a multicenter, open-label, active-controlled, randomized study in 500 pediatric patients from birth to less than 18 years with confirmed VTE. There were 276 children aged 12 to <18 years, 101 children aged 6 to <12 years, 69 children aged 2 to <6 years, and 54 children aged <2 years. Patients <6 months of age were excluded from enrollment if they were <37 weeks of gestation at birth, or had <10 days of oral feeding, or had a body weight of <2.6 kg. Index VTE was classified as either central venous catheter-related VTE (CVC-VTE), cerebral vein and sinus thrombosis (CVST), and all other VTE including DVT and PE (non-CVC-VTE). Patients received initial treatment with therapeutic dosages of unfractionated heparin (UFH), low molecular weight heparin (LMWH), or fondaparinux for at least 5 days, and were randomized 2:1 to receive either body weight-adjusted doses of rivaroxaban for oral suspension (exposures to match that of 20 mg daily dose in adults) or comparator group (UFH, LMWH, fondaparinux or VKA) for a main study treatment period of 3 months (or 1 month for children <2 years with CVC-VTE). A diagnostic imaging test was obtained at baseline and at the end of the main study treatment. When clinically necessary, treatment was extended up to 12 months in total (or up to 3 months in total for children <2 years with CVC-VTE). Table 28 displays the primary and secondary efficacy results. Table 28: Efficacy Results in EINSTEIN Junior Study – Full Analysis Set * Treatment schedule: body weight-adjusted doses of rivaroxaban for oral suspension (exposures to match that of 20 mg daily dose in adults); randomized 2:1 (Rivaroxaban for oral suspension: Comparator). † Confidence intervals for incidence proportion were calculated by applying the method of Blyth-Still-Casella. ‡ Unfractionated heparin (UFH), low molecular weight heparin (LMWH), fondaparinux or VKA. § Confidence intervals for difference in incidence proportions were calculated by unstratified exact method according to Agresti-Min using the standardized test statistic and inverting a two-sided test. Event Rivaroxaban for Oral Suspension * N=335 n (%) (95 % CI) † Comparator Group ‡ N=165 n (%) (95 % CI) † Rivaroxaban for Oral Suspension vs. Comparator Group Risk Difference (95 % CI) § Rivaroxaban for Oral Suspension vs. Comparator Group Hazard Ratio (95 % CI) Primary efficacy 4 (1.2) 5 (3) -1.8 % 0.4 outcome: Symptomatic (0.4 %, 3 %) (1.2 %, 6.6 %) (-6 %, 0.6 %) (0.11, 1.41) recurrent VTE Secondary efficacy outcome: Symptomatic recurrent VTE or asymptomatic deterioration on repeat imaging 5 (1.5) (0.6 %, 3.4 %) 6 (3.6) (1.6 %, 7.6 %) -2.1 % (-6.5 %, 0.6 %) Complete resolution of thrombus on repeat imaging without recurrent VTE occurred in 128 of 335 children (38.2 %, 95 % CI 33 %, 43.5 %) in the rivaroxaban for oral suspension group and 43 of 165 children (26.1 %, 95 % CI 19.8 %, 33 %) in the comparator group. Symptomatic recurrent VTE or major bleeding events occurred in 4 of 335 children (1.2 %, 95 % CI 0.4 %, 3 %) in the rivaroxaban for oral suspension group and 7 of 165 children (4.2 %, 95 % CI 2 %, 8.4 %) in the comparator group. 14.9 Thromboprophylaxis in Pediatric Patients with Congenital Heart Disease after the Fontan Procedure The efficacy and safety of rivaroxaban for oral suspension for thromboprophylaxis in pediatric patients with congenital heart disease who have undergone the Fontan procedure was evaluated in the UNIVERSE Phase 3 study [NCT02846532]. UNIVERSE was a prospective, open-label, active controlled, multicenter, 2-part study, designed to evaluate the single- and multiple-dose pharmacokinetic properties of rivaroxaban for oral suspension (Part A), and to evaluate the safety and efficacy of rivaroxaban for oral suspension when used for thromboprophylaxis for 12 months compared with aspirin (Part B) in children 2 to 8 years of age with single ventricle physiology who had the Fontan procedure. Patients in Part B were randomized 2:1 to receive either body weight-adjusted doses of rivaroxaban for oral suspension (exposures to match that of 10 mg daily dose in adults) or aspirin (approximately 5 mg/kg). Patients with eGFR <30 mL/min/1.73 m 2 were excluded. The median time between Fontan procedure and the first dose of rivaroxaban for oral suspension was 4 (range: 2 to 61) days in Part A and 34 (range: 2 to 124) days in part B. In comparison, the median time to initiating aspirin was 24 (range 2 to 117) days. Table 29 displays the primary efficacy results. Table 29: Efficacy Results in UNIVERSE Study – Full Analysis Set * Part A: single arm; not randomized † Part B: randomized 2:1 (Rivaroxaban for oral suspension: Aspirin) ‡ Confidence intervals for incidence proportion were calculated by applying the method of Blyth-Still-Casella. § Treatment schedule: body weight-adjusted doses of rivaroxaban (exposures to match that of 10 mg daily dose in adults) or aspirin (approximately 5 mg/kg) ¶ Confidence intervals for difference in incidence proportions were calculated by unstratified exact method according to Agresti-Min using the standardized test statistic and inverting a two-sided test. Part A * Part B † Event Rivaroxaban for Oral Suspension N=12 n (%) (95 %CI) ‡ Rivaroxaban for Oral Suspension§ N=64 n (%) (95 % CI) ‡ Aspirin§ N=34 n (%) (95 % CI) ‡ Rivaroxaban for Oral Suspension vs. Aspirin Risk Difference (95 % CI) ¶ Primary efficacy outcome: any thrombotic event 1 (8.3) (0.4 %, 34.9 %) 1 (1.6) (0.1 %, 7.8 %) 3 (8.8) (2.4 %, 22.2 %) -7.3 % (-21.7 %, 1.1 %) Ischemic stroke 0 (0 %, 23.6 %) 0 (0 %, 5.6 %) 1 (2.9) 0.2 %, 15.1 %) -2.9 % (-16.2 %, 2.9 %) Pulmonary embolism 0 (0 %, 23.6 %) 1 (1.6) (0.1 %, 7.8 %) 0 (0 %, 9 %) 1.6 % (-9.9 %, 8.4 %) Venous thrombosis 1 (8.3) (0.4 %, 34.9 %) 0 (0 %, 5.6 %) 2 (5.9) (1.1 %, 18.8 %) -5.9 % (-20.6 %, -0.1 %)